作业帮①1+1\2+1\6+1\12=1\20+1\30+1\42+1\56+1\72= ②1-1\2-1\4-1\8-1\16-1\32-1\64-1\128=
来源：学生作业帮助网 编辑：作业帮 时间：2024/11/06 13:54:30
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①1+1\2+1\6+1\12=1\20+1\30+1\42+1\56+1\72= ②1-1\2-1\4-1\8-1\16-1\32-1\64-1\128=
①1+1\2+1\6+1\12=1\20+1\30+1\42+1\56+1\72= ②1-1\2-1\4-1\8-1\16-1\32-1\64-1\128=
①1+1\2+1\6+1\12=1\20+1\30+1\42+1\56+1\72= ②1-1\2-1\4-1\8-1\16-1\32-1\64-1\128=
1+1\2+1\6+1\12=1\20+1\30+1\42+1\56+1\72=17/9
1-1\2-1\4-1\8-1\16-1\32-1\64-1\128=1/128